The Lady Cubs (1-19, 0-4) struggled against the defending Class 3 state champions Lady Mountaineers (13-8, 4-0) all night.
The green and white led 15-5 after one period and 35-7 at halftime.
Scoring for Mt. Vernon: Laynie Dake, 16 points; Mackenzie Farmer and Tamiaya Henderson, 13 each; Audrey Lasalle, 9; Karlie Meeks, 3; and Lexi Farmer, Payton Woodrum, Shae Vandergrift and Megan Pope, 2 apiece.
Scoring for Monett: Brooke McLean, 10 points; Faith Schmidt, Elizabeth Arnold and Haylee Morris, 4 each; and Kailee Ticknor, 1.
Monett will be in action at Cassville on Feb. 4.